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regex.h
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regex.h
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#ifndef HIGHLIGHT_REGEX_SCAN_H
#define HIGHLIGHT_REGEX_SCAN_H
#include <stdbool.h>
#include <stddef.h>
#include <string.h>
static inline bool js_regex_is_space(unsigned char c) {
return c == ' ' || c == '\t' || c == '\n' || c == '\r';
}
static inline bool js_regex_is_digit(unsigned char c) {
return c >= '0' && c <= '9';
}
static inline bool js_regex_is_alpha(unsigned char c) {
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
}
static inline bool js_regex_is_ident_char(unsigned char c) {
return js_regex_is_alpha(c) || js_regex_is_digit(c) || c == '_' || c == '$';
}
static inline bool js_regex_word_eq(const char *word, size_t len, const char *lit, size_t lit_len) {
return len == lit_len && memcmp(word, lit, lit_len) == 0;
}
static inline size_t js_regex_skip_ws_back(const char *code, size_t i) {
while (i > 0 && js_regex_is_space((unsigned char)code[i - 1])) i--;
return i;
}
static inline bool js_regex_word_allows_start(const char *word, size_t len) {
return
js_regex_word_eq(word, len, "return", 6) ||
js_regex_word_eq(word, len, "throw", 5) ||
js_regex_word_eq(word, len, "case", 4) ||
js_regex_word_eq(word, len, "delete", 6) ||
js_regex_word_eq(word, len, "void", 4) ||
js_regex_word_eq(word, len, "new", 3) ||
js_regex_word_eq(word, len, "typeof", 6) ||
js_regex_word_eq(word, len, "instanceof", 10) ||
js_regex_word_eq(word, len, "in", 2) ||
js_regex_word_eq(word, len, "of", 2) ||
js_regex_word_eq(word, len, "yield", 5) ||
js_regex_word_eq(word, len, "await", 5);
}
static inline bool js_regex_prev_forbids_start(unsigned char prev) {
return
js_regex_is_digit(prev) ||
prev == ')' || prev == ']' || prev == '}' ||
prev == '"' || prev == '\'' || prev == '`' || prev == '.';
}
static inline bool js_regex_prev_allows_start(unsigned char prev) {
switch (prev) {
case '(':
case '[':
case '{':
case ',':
case ';':
case ':':
case '=':
case '!':
case '?':
case '+':
case '-':
case '*':
case '%':
case '&':
case '|':
case '^':
case '~':
case '<':
case '>': return true;
default: return false;
}
}
static inline bool js_regex_can_start(const char *code, size_t start) {
if (start == 0) return true;
size_t i = js_regex_skip_ws_back(code, start);
if (i == 0) return true;
unsigned char prev = (unsigned char)code[i - 1];
if (js_regex_is_ident_char(prev)) {
size_t end = i;
while (i > 0 && js_regex_is_ident_char((unsigned char)code[i - 1])) i--;
return js_regex_word_allows_start(code + i, end - i);
}
if (js_regex_prev_forbids_start(prev)) return false;
return js_regex_prev_allows_start(prev);
}
static inline bool js_scan_regex_literal(
const char *code, size_t len,
size_t start, size_t *out_end
) {
if (start >= len || code[start] != '/') return false;
if (start + 1 >= len || code[start + 1] == '/' || code[start + 1] == '*') return false;
if (!js_regex_can_start(code, start)) return false;
size_t i = start + 1;
bool in_class = false;
for (; i < len; i++) {
unsigned char ch = (unsigned char)code[i];
if (ch == '\n' || ch == '\r') return false;
if (ch == '\\') {
if (i + 1 < len) i++;
continue;
}
if (in_class) {
if (ch == ']') in_class = false;
continue;
}
if (ch == '[') {
in_class = true;
continue;
}
if (ch != '/') continue;
i++;
while (i < len && js_regex_is_alpha((unsigned char)code[i])) i++;
if (out_end) *out_end = i;
return true;
}
return false;
}
#endif

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